Segments - Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2022	Jul. 03, 2021	Jul. 02, 2022	Jul. 03, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Net sales	$ 11,794,474	$ 8,789,164	$ 22,287,756	$ 15,806,304
Earnings (losses) before income taxes and noncontrolling interests	3,490,402	2,025,748	6,388,517	3,323,994
Total assets	31,668,457		31,668,457		$ 25,823,072
Operating Segments [Member] | Steel Mills [Member]
Segment Reporting Information [Line Items]
Net sales	7,256,067	5,909,909	13,774,676	10,518,686
Earnings (losses) before income taxes and noncontrolling interests	2,815,723	2,174,807	5,394,577	3,489,781
Total assets	15,255,411		15,255,411		13,235,463
Operating Segments [Member] | Steel Products [Member]
Segment Reporting Information [Line Items]
Net sales	3,842,948	2,241,107	7,166,036	4,051,162
Earnings (losses) before income taxes and noncontrolling interests	1,129,932	259,330	1,814,799	471,142
Total assets	12,464,340		12,464,340		7,845,010
Operating Segments [Member] | Raw Materials [Member]
Segment Reporting Information [Line Items]
Net sales	695,459	638,148	1,347,044	1,236,456
Earnings (losses) before income taxes and noncontrolling interests	263,598	120,143	359,451	343,378
Total assets	3,678,516		3,678,516		3,870,806
Intercompany Eliminations [Member] | Steel Mills [Member]
Segment Reporting Information [Line Items]
Net sales	1,763,563	1,496,298	3,356,821	2,721,411
Intercompany Eliminations [Member] | Steel Products [Member]
Segment Reporting Information [Line Items]
Net sales	117,289	80,394	251,995	151,613
Intercompany Eliminations [Member] | Raw Materials [Member]
Segment Reporting Information [Line Items]
Net sales	4,145,690	4,009,808	7,692,209	7,656,003
Corporate and Eliminations Items [Member]
Segment Reporting Information [Line Items]
Net sales	(6,026,542)	(5,586,500)	(11,301,025)	(10,529,027)
Earnings (losses) before income taxes and noncontrolling interests	(718,851)	$ (528,532)	(1,180,310)	$ (980,307)
Total assets	$ 270,190		$ 270,190		$ 871,793